ChemGlobe: Krypton
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/36.html

LANL: Krypton
- History, sources, isotopes, and uses.
- http://periodic.lanl.gov/elements/36.html

Wikipedia: Krypton
- Properties of the element, including its history, applications, and characteristics.
- http://en.wikipedia.org/wiki/Krypton

Lenntech: Krypton
- Physical data, chemical properties, health and environmental effects.
- http://www.lenntech.com/Periodic-chart-elements/Kr-en.htm

Visual Elements: Krypton
- General and physical information, uses, key isotopes, and ionisation energies.
- http://www.chemsoc.org/viselements/pages/krypton.html

Especiál Gas Inc.: Krypton
- Numeric data, uses, and general information.
- http://www.c-f-c.com/specgas_products/krypton.htm

Chemical Elements.com: Krypton
- Basic information, atomic structure, and table of isotopes.
- http://www.chemicalelements.com/elements/kr.html

It's Elemental: Krypton
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele036.html

EnvironmentalChemistry.com: Krypton
- Atomic structure, properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Kr.html

What Does the Element Krypton Look Like?
- Explanation with photographs.
- http://education.jlab.org/qa/krypton.html

Britannica Nobel Prize: Krypton
- Overview and basic data.
- http://www.britannica.com/nobel/micro/329_89.html